package com.fanco.learn_datastruct_leetcode.designpattern.facade;

/**
 * @author qiaowang 2022/2/15
 * 描述
 */
public class Screen {
    private static Screen screen = new Screen();

    public static Screen getInstance() {
        return screen;
    }

    private Screen () {}

    public void up() {
        System.out.println("Screen up");
    }

    public void down() {
        System.out.println("Screen down");
    }
}
